Find the temperature of air given frequency and wavelength?

1. The problem statement, all variables and given/known data
A sound wave has a frequency of 722 hz and a wavelength of .54 m. What is the temperature of the air? Assume the velocity of sound at 0 degrees Celsius is 327 m/s.

2. Relevant equations
V= lambda * frequency

3. The attempt at a solution
I have no idea what to from there? The velocity of the wave is 389.88 m/s. Thanks in advance.